Broaching machine



M. E. INFIORATI, JR.

BROACHING MACHINE. APPLICATION FILED FEB.21,1920.

Patented Feb. 7, 1922.

I I L LLLd i 3 343 14 1 35 10 win 5}) J I 'zl Z2 INVENTOR. flli'jrzford W? M. E. INFIORATI, JR.

BROACHING MACHINE.

APPLICATION FILED FEB. 21, 1920.

Patented Feb. 7, 1922.

3 SHEETS-SHEET 2.

INVENTOR. 171.2772! ioraidk I 5 ATTORNEY M. E. INFIORATI, JR.

BROACHING MACHINE.

APPLICATION FILED FEB, 21,1920- Patented Feb. 7, 1922.

3 SHEETS-SHEET 3.-

INVENT'OR.

.unrrsn STATES PATENT ,oFFic MATTE-O E. INFIORATI, JR., OF NEW LONDON, CONNECTICUT, ASSIGNORITO J'.'

LAIOINTE CO., OF NEW LONDON, CONNEC'IITICUiI."

naoncnme MACHINE.

T 0 all w 750m it may concern Be it known that I, 'Mn'r rno E1INFIORATI, J12, a citizen ofthe United States, residing at New London, in the county of New London and State of Connecticughave invented new and useful Improvements in Broaching Machin'eabf which the following-is a speciiication. I

This invention relatesto broaching machines. l

Some of the objects of the invention are: to produce a more practical device ofthe character mentioned; to; increase or maximize the working capacity-eta machine of this character by making'it more thoroughly eflicient. WVith these and other objects in view the invention resides in theparticular provision, arrangement and combination of parts described=in the 'following specification and illustrated in the accompanying drawing in which: Q

Figure 1 is a top plan view of a machine embodyingthe present invention. 7

Figure 2 isa side elevation. I Figure 3 is a vertical longitudinal section view. 7

Figure 4 is a detailtransverse sectional view taken on'the line 44 of Figure 3,

illustrating more clearlyhow the tool holder block 'isarranged for movement" and also illustrates the parts of the clutch. j

Figure 5 is'a detail sectional vlew taken on the line 5-5 of. Figure 4. I

Figure 6 is a transverse detail sectiona view taken on the line 66 of Figure 3, and illustrates the reversing gears.

Figure 7 is a detail sectional view taken on the line 77 of Figure3,'and illustrates the'nut and its correlated gears for pulling the broaching tool in a working direction.

Figure 8 is a detached perspective view of the keyed bushing with which the reversinogears areco'rrelated. F Figure 9 is adiagrammaticfview illustrating the manner of operation of the belt shifting means which is also utilized for actuating the toothed clutch forming a part oi the invention. f I a 1 At the outset, it might be well toexplain that in order to successfully-carry out the 7 Specification of Letters Patent.

compared with the return speed. It is essentlal forobtaining the maximum working has been sought to attain these desirable characteristics hitherto but the machines in present use are notaltogether satisfactory Patented Feb. 7, 1922. Application filed February 21, 1920. Serial No. 360,439. 7 J

and the present invention is designed to overcome known objections and to render a machine of the present character compara tively practical and more thoroughly ef- Referring now to the'drawing, itiwill be seen, that the machine includes pedestals l0 and 11. The pedestal 11 embodies a gear case 12 which encloses gears supported by the pedestal 11, the function of which gears will be explained hereinafter. A frame '13 is supported by the pedestals 10 and 11 and this frame embodies guides 14=-14. A threaded element 'or screw 15 is arranged uponthe machine and is adapted to be pulled in one direction which is to be known as the working direction? and this screw is adapted to be rotated to effect the longitudinal movement of the. screw in an opposite direction to its working direction which is to be known as the reverse direction. The screw 15 istarranged between a slidable block 16and driven means 17 which.

is rendered active by driving means.

The block 16 is. provided with groqves .19

which receive the guides 1 1-14. The block 16 has slidably and adjustably mounted thereon, a tool holder 20.. Adjustment of the tool holder 20 is effected by the use of an adjusting screw 21 supported 22 secured to. said block.

.by a bracket In order that .the screw 15 may held "against rotation at a predetermined time there is provided a toothed clutch 30 which comprises co-actingclutch elements 31and 32. The clutch element 31 isloosely' mounted on the screw 15 and is held against longitudinal movement with respect to said screw. The clutch element 32 is splined on thescrew 15 asshown at 33 inF-igure 4 of the drawing andis arranged; for longitudinal movement with respect to said screw'for co-action with the element 31; A spring pressed yoke 34 is pivoted as'at 35. and this yoke is correlated with the clutch element 32. 'The'spring' 36which bears against the upper free end :of w

the yoke 34 has a normal tendency to force the clutch element 31 into engagement with the clutch element 32 and a pivoted cam lever 37 is employed to effect movement of the yoke 34 against its spring to maintain the disengagement of the clutch element 32 with the other-element 31. The cam lever 37 is connected to a slide 38 by a pin and slot connection 39,the slide operating in a guide 40'and having its free end provided with anti-friction rollers'41.

The driven means 17 for effecting the movement of the screw 15, its correlated block 16 and tool holder 20, comprises a nut 45 which is mounted for periodical rotation in the bearing 46 forming a partof the gear case12; A gear' 47 is keyed to the nut 45 and this gearfas well as the nut 45is held 7 7 against longitudinalmovement with respect to the screw 15 by the nuts48, a thrust anti- :frictionbearing 49 and the spacer 50, inasmuch as the reverse gear 51- fills the space between the spacer 50 and the bearing 52 of the case 12. The reverse gear 51 is keyed to a bushing. 53 which surroundsthe screw 15 "and which bushing is provided with keys -54 which are received by keyways 5 5 in the screw 15 The-bushing 53. is rotatable in the drawing.

' gear 47; A bushing v65 surrounds the shaft andha's keyed-thereto a gear 66 which meshes with'thereverse gear51. A pulle '67 is keyed to the bushing and the 'sha t 60 hasarranged thereon a loose pulley 68.

and fast pulley 69.. These pulleys are driven y a belt '70-which is shifted by means to be presently; described which also serves to cause the functioning of the clutch means 30. This latter means con'sistsof a rod 71 whichis slidably mountedin bearings 72 and has a belt encircling 'member 73. The rod 71 is slid by theuse of a. pivoted lever 74 which has pin and'slot connection 75 with said rod.

, "A rod 76 is'pivoted-to said lever 74 as at 77 1 and is pivoted as-at 78 to a hand lever 79 pivoted as at 80to the frame 13. The rod ,76 is disposed between the rollers 41 carried bythe slide 38 and in moving the rod by the use ofthei handlev'er79 to shift the belt 70,

the slide 38 is moved upwardly. and downwardly, as the case may be as well.

1 In practice and assuming that the broaching tool is to be moved in a working direction for'dressing-or for cutting away holes that are already in a piece of material, the

hand lever 79 ismoved to the position A I shown in Figure 9 of the drawing which will cause the belt 70 to-lbeshifted to the pulley clutch element 31.

complished by moving the hand lever 79 to the position B shown in Figure 9 of the drawing which causes the belt 70 to move] 32 to cause the sameto move out of coaicting comparatively increased rate of speed. The

69 and causes the slide 38 to move downwardly by reason of the engagement of the rod 76 with the rollers 41. The downward movement of theslide 38 causes the cam lever 37 to move to a position which-permits the spring 36 to move the yoke 34, on its pivot thereby causing the clutch element 32 to move into co-acting relation with the Inasmuch as the clutch element 32 is splined upon the screw 15, and furthermore, inasmuch as the clutch element 31 is held stationary, the screw 15 will be held against rotation. The pulley 69 being a fast pulley causes the shaft 60 to rotate and through the intervention of the pinion 64 and the gear 47, the nut 45 will be caused to rotate with the result that the screw 15 will be pulled in a working direction. .The return of the tool holder and its tool to its initial position is .to be accomplished with maximum practical speed as compared with the speed at which these parts travel in a working direction which is effected by .moving the gear 47 at approximately 196 revolutions per minute. 7 The ratio of the return speed as compared with the working speed is 10 to 1. In other words, the reverse gear 51 rotates 1,960 revolutions per minute as compared withthe number of revolutions, of the gear 47 :inthe same period of time; The use of thereverse gear 51 ;and its companion gear 66 tends toj the practicableness of the machine. The return movement of the screw 15-, in a reverse direction, is acinto operative relation with the pulley 67, and this movement of the hand lever 79 causes the rod 76 to move the slide 38 upwardly, which results in the movement of the cam lever 37 to a position which causes the yoke 34'to move on its pivot and by'reason of its correlation with the clutch element relation with the other clutch element 31,

thus permitting the screw 15 to rotate freely.

Inasmuch as the pulley 67 is keyed to the bushing 53, andv through the intervention of the gears 51 and 66, the bushing 53 will be 53 is provided with keys which enter the keyways 55 in the screw 15, the screw will the gear 47 and the weight behind it of cor related parts, the screw will be moved by threading action in a reverse direction at a screw 15 is made to move through a tube housing 81 which ensures the safety of workrrilen who have occasion to approach the ma 0 me. I

While there has been shown the preferred 7 embodiment of this invention, it is to be un- 130 caused to rotate. Inasmuch as the bushing [bodily derstood thatchanges, alterations and modifications withinth scope of jthe appended claims may be res'ortedto when desiredl What is claimedfa'snewisz- '1. Abroachi'ngfinachme includlng a tool holder, a Sereweonneaed to saidtool holder,

means for perlodicallyfpulling said screw in ,one directionwithcut rotatingthe 2, rl'broachingi nacliine including a tool, holder, a screw connected to said tool holder, means for periodically pulllng said screw bodily in one direction without rotating the saine and means forTperiodically rotating tive and inoperative.

said screw to move the samefbodily in a reverse direction, I the glsaid means including -t ittently operable gears, and meansfor rendering the firstmentionjed m'eans'opera- 31A broaching machine including a i001 holder, a screw connected to'the tool holder and movable in a rectilinear path, means forpulling said screw in one direction with- 1' out rotating the same, means for moving it 1n a reverse direction by rotating 1t, and

means for rendering said first mentioned means operative and inoperative.

4. A broaching machine including a reciprocal tool holder, a screw connected to said tool holder, driven means for moving the screw in one direction without rotating the screw including a threaded member engageable with said screw, a gear secured to said member, a shaft, a pinion which meshes with said gear on said shaft, belt driven'fast and loose pulleyson said shaft and belt shifting means for setting in motion the fast or the loose pulley.

5. A broaching machine including a tool holdc a screw having grooves therein connected to said tool holder, a screw threaded member which coacts with said screw, a gear carried by said member, a rotatable bushing having keys which areengageablein the grooves in said screw, a gear keyed to said. bushing, a shaft, a pinion keyed to said shaft which meshes with said first gear, a seconc shaft, a pinion keyed to said second shaft which meshes with said'second gear, belt driven fast and loose pulleys on said first shaft, a belt driven fast pulley on said second shaft, and belt shifting means for setting said fast pulleys in motion.

6. A broaching machine including a tool holder, a screw connected to said tool holder," mechanism formoving the screw comprising a threaded member engageable with said screw, a gear secured to said member, a keyed bushing whose keys are disposedin grooves in said screw, a gear secured to said bushing, a shaft, a pinion secured to said shaft, a pulley fast on said shaft which meshes with said first gear, a second shaft, a gear which meshes with said second gear on said second shaft, a fast pulley onsaid sec-. ond shaft and belt shifting means for se-' l'ectively setting either of the said pulleys in motion for themovement of said tool holder back' 'and forth..

" 7 b achingmachineincluding a tool holder, as rew connected to said tool holder,

mechanism for eflecting the a movement of said screw 1n ayrectil near gath at a predetermined speed, in a working direction without rotating the same by pulling the same,i and for effecting the movementof' screw inaireversejdirection at a predetermln'ed ncreased speed as compared the tool holder', means "for 7 moving said I screw in vone direction in'a rectilinear path without rotating the same, and means for moving said screw 'reversely in a rectilinear path by fotatin'g the same,thesaid screw I ncluding slidable tool holder, a screw connected to "with'its speed'when moving in the working i being moved at a "particular speed in one direction and at an increased speed in an" opposite direction.

9. In a broaching machine, a slidable block having mounted thereon a tool holder, mechanism for moving said block which includes a screw and a nut, driving means, a clutch embodying co-acting members one of said members being held against longitudisaid clutch members bein splined on said screw, and means for e ecting the movement of said splined clutch member into co-acting relation with the other of said clutch members for rendering active the drivin means.

10.' n a broaching machine, a slidable block having mounted thereon a tool 11. In a broaching machine, a slidable block having thereon a. tool holder, a screw connected to said block, mechanism for moving said screw to and fro which includes a nut, a clutch embodying coacting members one of said members being held agalnst longitudinal movement with respect to said screw by said block,the otherclutch member being splined on said screw, means for effecting the movement of said splined clutch nal 'movement on said screw, the other of member into co-acting vrelation with the otherclut-ch member to prevent therotation of said screwand for allowing the operation ofthe driving means. 12. In abroaching machine a block having thereon a'tool holder, mechanism for,

7 moving said block to and fro, which includes a screw, a nut which co-acts with 831d screw, driving means, .a clutch, and means for renderingthe'drivin'g means and clutch active to rotate said nut and to hold said screw against rotation relative to said nut.

13. In a broach'ing machine a block'having thereon a tool holder, mechanism -for' moving saidblock to and fro, which includes a screwda nut which co-acts with; said screw, driving means, a clutch carried by 7 said block and means for rendering thedrivin-g said block which includes a screw, a nut which co-acts with said 'screw, driving means, a clutch forlholding said (screw. against rov tation when moving the block in one direction and means forrrenderingsaid driving means active to cause the rotation of "said screw ,to efiectthe return movement of said block at .a predetermined speed.

,l 5. A breaching V slidable ;bl0ck wh1ch carries a tool holder,

machine comprising a 7 means includingascrew operable tomove V i said block IO and iro at variable speeds,

driving means including ,a driving belt, belt shifting means including a rod, a; clutch c carried by said block which comprises c0 acting members, ,a; spring. fpressed vyoke correlated with one vof said members, a pair of levers one of which embodies a cam'engageable with .said yoke, the cam lever @being. operativel connected to'jsaid rod. I

7 1 6, 1 echan-ism comprising guides, a block arranged (for movement .on said guides, a tool holder zadjustabvly 'fmjounted on said block, a reciprocating screw connected to said block, ,a clutch arranged Ion said block and operative to hold said screw against" rotation ,at predetermined times, and means for moving said screw.

In testimony where signature.

MATTEO'E, INFIORATI, JR. cr I have ailiized' my' 

